Common loanword used in casual and technical contexts, such as software help menus, customer support, or general assistance.
Please try reading the app's help section.
If you're in trouble, please ask for help right away.
困ったときは、いつでもヘルプを呼んでいいよ。
When you're in trouble, you can always call for help.
This task needs some extra help.
I asked a colleague for help and finished the task.
If you don't understand something, press the help button.
My teammate was about to be beaten, so I stepped in to help.
援助 is a formal word for aid, often financial or material support between organizations or countries, while ヘルプ is a casual loanword for everyday assistance.
Borrowed from English 'help'.